48.下列那一種人類流感病毒(influenza virus)型別之變異性較高?
(A)H1N1
(B)H3N2
(C)influenza B
(D)influenza C
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統計: A(883), B(971), C(114), D(76), E(0) #1557878
統計: A(883), B(971), C(114), D(76), E(0) #1557878